I could never afford to own old Packard cars like you see above,
but the models are good enough to just have on the layout.
If you look at the far pump island, there's a "high boy"
bulk oil container with pump. Generally, it contained 20wt. oil and sometimes
it was Non Detergent oil. Way before engine emission devices, a lot of men
used this oil as it was cheaper even though sludge built up in the crankcase.
If those motorist switched to detergent oil, it would loosen up the layer
of sludge and cause oil flow problems. Pennsylvania Oil Company through
news paper article ads used to try and convince motorist to switch over
to detergent oil anyway. This was about the time multi grade oil became
available like 10w30.